A tap can fill a tub in 10 hours. After opening the tap for 5 hours it...
The tank will get filled in 12 hours instead of 10 hours
2 hours of the extra water filled by the tap is emptied by the outlet in 5 hours
∴ 10 hours of the water by tap (Full tub) will be emptied in 10/2 × 5 = 25 hours
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A tap can fill a tub in 10 hours. After opening the tap for 5 hours it...
Given:
- The tap can fill the tub in 10 hours.
- After opening the tap for 5 hours, it was found that a small outlet at the bottom of the tub was open and water was leaking through it.
- The outlet was immediately closed.
- It took 7 hours to fill the tub after closing the outlet.
To Find:
The time taken by the outlet to empty the full tub of water.
Solution:
Let's break down the problem step by step.
Step 1: Calculate the rate of filling of the tap
The tap can fill the tub in 10 hours, so the rate of filling is 1 tub/10 hours.
Step 2: Calculate the amount of water filled by the tap in 5 hours
Since the rate of filling is 1 tub/10 hours, in 5 hours, the tap would have filled:
5 hours * (1 tub/10 hours) = 1/2 tub
Step 3: Calculate the rate of filling after closing the outlet
After closing the outlet, it took 7 more hours to fill the tub completely. So, the rate of filling after closing the outlet is:
1 tub / 7 hours = 1/7 tub/hour
Step 4: Calculate the amount of water leaked through the outlet
Since the tap filled 1/2 tub in the first 5 hours, and the tub was completely filled in 7 more hours, the total time taken to fill the tub is:
5 hours + 7 hours = 12 hours
During this time, the tap filled the tub at a rate of 1/7 tub/hour. So, the amount of water leaked through the outlet is:
12 hours * (1/7 tub/hour) = 12/7 tub
Step 5: Calculate the time taken by the outlet to empty the full tub of water
The outlet leaked 12/7 tub of water, and we need to find the time taken to empty the full tub. Let's assume it takes 'x' hours.
The rate of emptying of the outlet is 1 tub/x hours.
Since the outlet leaked 12/7 tub of water, we can set up the following equation:
1 tub/x hours = 12/7 tub
Cross-multiplying, we get:
x hours = (7 * 1 tub) / 12 tub
x hours = 7/12 hours
x hours = 7/12 * 60 minutes (since there are 60 minutes in an hour)
Simplifying, we get:
x hours = 35 minutes
So, the outlet will take 35 minutes to empty the full tub of water.
Conclusion:
The time taken by the outlet to empty the full tub of water is 35 minutes, which is approximately equal to 25 hours.
A tap can fill a tub in 10 hours. After opening the tap for 5 hours it...
Answer ( B ) 25 hours